Optimization of a Technological Solution Used to Waterproofing Rehabilitation for Building Infrastructure

Tamas, Florin; Mizgan, Paraschiva; Muntean, Radu; Cazacu, Christiana; Galatanu, Teofil Florin

doi:10.1016/j.proeng.2017.02.405

Cited by 2 publications

(2 citation statements)

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“…(7) Color changes indicate that operational changes must be made, especially in the composition and concentration of the solutions used, to try to reduce the risk associated to this factor. (8) In addition to its function as consolidation treatment, the precipitated compounds, in some cases, open the possibility that the treatment can be applied to give to the treated material fireproof properties. To confirm this hypothesis and also to confirm that the behavior of these compounds would still be better with other ornamental rocks with which they are more compatible from the chemical point of view (for example on calcareous/dolomitic stones), it is necessary to perform additional studies, which could mean new research lines to follow in the future in this kind of treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Different techniques have been developed in the field of maintenance and rehabilitation of monuments and infrastructures in order to reduce the deterioration caused by water and soluble salts. In the case of water, efforts are focused on hindering moisture penetration into the structure, as stated in refs and , by (I) reducing the sorptivity of the material, i.e., construction of subsoil drains around the monument, wall cutting to the insertion of impermeable materials against capillary flux, and injection of chemical barriers or water repellents; , (II) increasing the evaporation rate using different systems such as the installation of wall base ventilation systems, , thermal methods, and restoration of plaster by ones with high porosity and high water vapor transport; and (III) moving the moisture flow using systems based on active and passive electro-osmosis. , In many cases it is necessary to apply more than one intervention strategy, for example electro-osmosis and drying plaster. In the case of soluble salts, the main strategy is to reduce, as far as possible, the ion content from porous building materials by the application of different desalination techniques such as immersion baths in water for small size pieces, , application of poultices on the affected surface made with different materials, , use of crystallization modifiers into the pores, , and application of electrokinetic techniques. − …”

Section: Introductionmentioning

confidence: 99%

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Electroprecipitation of Magnesium and Calcium Compounds for Weathering Protection of Ornamental Rocks

Feijoo

Fort

Gomez-Villalba

et al. 2020

Crystal Growth & Design

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Electroprecipitation can be considered as a novel consolidation technique that can compete with commercial consolidation treatments, since it allows reduction of its accessible porosity, both superficially and in-depth, increasing considerably its mechanical properties and precipitating a compound chemically compatible with the material to be treated. The purpose of this study is to assess the effectiveness of the electroprecipitation of four different inorganic compounds constituted by magnesium and calcium carbonate, calcium phosphate, and calcium oxalate, in 6 cm thick specimens of quartz-arenite. The suitability of the treatment was assessed in samples treated and aged for 4 years under environmental conditions, comparing the changes caused in structural properties (measuring the ultrasonic pulse velocity, anisotropy, tortuosity, pore size distribution, and mercury accessible porosity), mechanical properties (superficial hardness, uniaxial compressive strength, and drilling resistance) and aesthetic properties (color). In addition, the morphology and composition of the compound precipitated were assessed by XRD and SEM-EDX. This study found that the precipitation of the insoluble compounds by this technique (I) takes place in a homogeneous way, reducing the anisotropy of the material and its tortuosity, which increases the durability of the material against the action of external agents, such as water, soluble salts, and pollutants; (II) increases the mechanical properties and causes a considerable increase in the ultrasonic wave transmission; (III) allows filling almost completely the pores where it precipitates, which reduces the damage risk caused by crystallization pressures; (IV) produced, under these treatment conditions (environmental conditions, confined space and forced precipitation by an electric field), the precipitated phases magnesite, hydromagnesite, calcite, hydroxyapatite, and wewhellite. However, the color changes detected indicate that it is necessary to carry out previous studies in the laboratory to reduce this aesthetic problem, before applying it on-site on a certain material, especially in heritage constructions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electroprecipitation of Magnesium and Calcium Compounds for Weathering Protection of Ornamental Rocks

Feijoo

Fort

Gomez-Villalba

et al. 2020

Crystal Growth & Design

View full text Add to dashboard Cite

show abstract

Development of an Assessment Method to Evaluate the Quality of Remedial Treatments on Concrete Flat Roofs of Multiple Buildings

et al. 2019

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Existing assessment tools have not been successfully used to evaluate the performance of the remedial treatment of concrete flat roofs by building users or building management personnel because they are complicated and difficult to be applied by non-experts. In this study, a semi-quantitative method has been developed to assess the quality of remedial treatment on concrete flat roofs of multiple buildings. A 10-point scale weighting was calculated based on the results of ranking, and then the score assessment scheme was developed. Results revealed that the repairing principles included protection against ingress (W = 7.25), physical resistance against ingress (W = 5.23), concrete restoration (W = 8.22), structural strengthening (W = 8.22), moisture control (W = 6.59), and chemical resistance (W = 4.57). The grouped principles included physical resistance (W = 6.24), structural stability (W = 8.22), and chemical resistance (W = 5.58). The scoring assessment scheme was applied to a remedial treatment on multilayer concrete flat roof which was treated with bituminous membrane. The assessment scheme was revised based on the surveyors’ comments and then verified by the experts. This assessment method secured and improved the quality of the remedial treatment, since the building management staff/owner successfully evaluated, controlled, and monitored the quality of remedial treatments.

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Optimization of a Technological Solution Used to Waterproofing Rehabilitation for Building Infrastructure

Cited by 2 publications

References 1 publication

Electroprecipitation of Magnesium and Calcium Compounds for Weathering Protection of Ornamental Rocks

Electroprecipitation of Magnesium and Calcium Compounds for Weathering Protection of Ornamental Rocks

Development of an Assessment Method to Evaluate the Quality of Remedial Treatments on Concrete Flat Roofs of Multiple Buildings

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